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Henri Abraham
Henri Abraham (1868–1943) was a French physicist who made important contributions to the science of radio waves. He performed some of the first measurements of the propagation velocity of radio waves, helped develop France's first triode vacuum tube, and with Eugene Bloch invented the astable multivibrator. Life Henri Abraham was born July 12, 1868 in the 1st arrondissement of Paris. After brilliant studies at Chaptal secondary school, from 1886 to 1889 he pursued scientific graduate studies at the École Normale Supérieure, where he attended the lectures of physics professors Jules Violle and Marcel Brillouin, and the Faculty of Paris, where he studied physics with Gabriel Lippmann and Edmond Bouty and obtained degrees in physical sciences and in mathematical sciences. He was then appointed for one year preparer physics laboratory of the École Normale Supérieure, then led by Jules Violle, where he wrote his thesis for the doctorate in physical sciences: "New determinati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henri Abraham Studio Harcourt
Henri is an Estonian, Finnish, French, German and Luxembourgish form of the masculine given name Henry. People with this given name ; French noblemen :'' See the ' List of rulers named Henry' for Kings of France named Henri.'' * Henri I de Montmorency (1534–1614), Marshal and Constable of France * Henri I, Duke of Nemours (1572–1632), the son of Jacques of Savoy and Anna d'Este * Henri II, Duke of Nemours (1625–1659), the seventh Duc de Nemours * Henri, Count of Harcourt (1601–1666), French nobleman * Henri, Dauphin of Viennois (1296–1349), bishop of Metz * Henri de Gondi (other) * Henri de La Tour d'Auvergne, Duke of Bouillon (1555–1623), member of the powerful House of La Tour d'Auvergne * Henri Emmanuel Boileau, baron de Castelnau (1857–1923), French mountain climber * Henri, Grand Duke of Luxembourg (born 1955), the head of state of Luxembourg * Henri de Massue, Earl of Galway, French Huguenot soldier and diplomat, one of the principal commanders of B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Société Française De Physique
The Société Française de Physique (SFP), or the French Physical Society, is the main professional society of French physicists. It was founded in 1873 by Charles Joseph d'Almeida. History The French Physical Society is a state-approved non-profit scientific society aiming to promote the knowledge of physics. Its member include physicists living in France, regardless of background. As well as promoting physics, the SFP also acts as a lobbying organization with French policymakers alongside other scientific societies, the like the French Academy of Sciences, French Society of Mathematicians, and Union of Physicists. The SFP organizes a large number of events (conferences, workshops, exhibitions, etc.) for academic and general audiences. The SFP edits the ''Bulletin Newsletters'' and the review ''Reflets de la Physique''. Each year, the SFP awards several prizes to physicists in honor of specific works or actions towards the promotion of physics outside the community. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1868 Births
Events January–March * January 2 – British Expedition to Abyssinia: Robert Napier leads an expedition to free captive British officials and missionaries. * January 3 – The 15-year-old Mutsuhito, Emperor Meiji of Japan, declares the '' Meiji Restoration'', his own restoration to full power, under the influence of supporters from the Chōshū and Satsuma Domains, and against the supporters of the Tokugawa shogunate, triggering the Boshin War. * January 5 – Paraguayan War: Brazilian Army commander Luís Alves de Lima e Silva, Duke of Caxias enters Asunción, Paraguay's capital. Some days later he declares the war is over. Nevertheless, Francisco Solano López, Paraguay's president, prepares guerrillas to fight in the countryside. * January 7 – The Arkansas constitutional convention meets in Little Rock. * January 9 – Penal transportation from Britain to Australia ends, with arrival of the convict ship '' Hougoumont'' in Weste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kerr Effect
The Kerr effect, also called the quadratic electro-optic (QEO) effect, is a change in the refractive index of a material in response to an applied electric field. The Kerr effect is distinct from the Pockels effect in that the induced index change is directly proportional to the ''square'' of the electric field instead of varying linearly with it. All materials show a Kerr effect, but certain liquids display it more strongly than others. The Kerr effect was discovered in 1875 by Scottish physicist John Kerr. Two special cases of the Kerr effect are normally considered, these being the Kerr electro-optic effect, or DC Kerr effect, and the optical Kerr effect, or AC Kerr effect. Kerr electro-optic effect The Kerr electro-optic effect, or DC Kerr effect, is the special case in which a slowly varying external electric field is applied by, for instance, a voltage on electrodes across the sample material. Under this influence, the sample becomes birefringent, with different indi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Charge
Electric charge is the physical property of matter that causes charged matter to experience a force when placed in an electromagnetic field. Electric charge can be ''positive'' or ''negative'' (commonly carried by protons and electrons respectively). Like charges repel each other and unlike charges attract each other. An object with an absence of net charge is referred to as neutral. Early knowledge of how charged substances interact is now called classical electrodynamics, and is still accurate for problems that do not require consideration of quantum effects. Electric charge is a conserved property; the net charge of an isolated system, the amount of positive charge minus the amount of negative charge, cannot change. Electric charge is carried by subatomic particles. In ordinary matter, negative charge is carried by electrons, and positive charge is carried by the protons in the nuclei of atoms. If there are more electrons than protons in a piece of matter, it will have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heinrich Hertz
Heinrich Rudolf Hertz ( ; ; 22 February 1857 – 1 January 1894) was a German physicist who first conclusively proved the existence of the electromagnetic waves predicted by James Clerk Maxwell's equations of electromagnetism. The unit of frequency, cycle per second, was named the "hertz" in his honor.IEC History . Iec.ch. Biography Heinrich Rudolf Hertz was born in 1857 in , then a sovereign state of the German Confederation, into a prosperous and cultured Hanseatic family. His father wa ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Tube Multivibrator Calibrating Wavemeter 1920
A vacuum is a space devoid of matter. The word is derived from the Latin adjective ''vacuus'' for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often discuss ideal test results that would occur in a ''perfect'' vacuum, which they sometimes simply call "vacuum" or free space, and use the term partial vacuum to refer to an actual imperfect vacuum as one might have in a laboratory or in space. In engineering and applied physics on the other hand, vacuum refers to any space in which the pressure is considerably lower than atmospheric pressure. The Latin term ''in vacuo'' is used to describe an object that is surrounded by a vacuum. The ''quality'' of a partial vacuum refers to how closely it approaches a perfect vacuum. Other things equal, lower gas pressure means higher-quality vacuum. For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. But high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three Physicists Prize
The Three Physicists Prize (french: Prix des trois physiciens) is a physics prize awarded by the École Normale Supérieure (ENS) in Paris and the Eugène Bloch Foundation. It is named in honour of the physicists Henri Abraham, Eugene Bloch and Georges Bruhat, who were successive directors of the physics laboratory at the ENS and all of whom were murdered in Nazi concentration camps between 1943 and 1945. The prize was established by Bloch's widow. Winners * 1951 Jean Cabannes * 1952 Maurice Bayen * 1953 Gustave Ribaud * 1954 Maurice Ponte * 1955 ''not awarded'' * 1956 Nevill Francis Mott * 1957 H. B. G. Casimir * 1958 J. Robert Oppenheimer * 1959 André Danjon * 1960 Gaston Dupouy * 1961 Max Morand * 1962 Jean Weigle * 1963 Louis Néel * 1964 André Lallemand * 1965 Alfred Kastler * 1966 Francis Perrin * 1967 Pierre Auger * 1968 Jean-François Denisse * 1969 Jean-Claude Pecker * 1970 Albert Kirrmann * 1971 Jean Coulomb * 1972 André Guinier * 1973 Pierre Grivet * 1974 Jean ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auschwitz Concentration Camp
Auschwitz concentration camp ( (); also or ) was a complex of over 40 concentration and extermination camps operated by Nazi Germany in occupied Poland (in a portion annexed into Germany in 1939) during World War II and the Holocaust. It consisted of Auschwitz I, the main camp (''Stammlager'') in Oświęcim; Auschwitz II-Birkenau, a concentration and extermination camp with gas chambers; Auschwitz III-Monowitz, a labor camp for the chemical conglomerate IG Farben; and dozens of subcamps. The camps became a major site of the Nazis' final solution to the Jewish question. After Germany sparked World War II by invading Poland in September 1939, the '' Schutzstaffel'' (SS) converted Auschwitz I, an army barracks, into a prisoner-of-war camp. The initial transport of political detainees to Auschwitz consisted almost solely of Poles for whom the camp was initially established. The bulk of inmates were Polish for the first two years. In May 1940, German criminals br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bobigny
Bobigny () is a commune, or town, in the northeastern suburbs of Paris, Île-de-France, France. It is located from the centre of Paris. Bobigny is the prefecture (capital city) of the Seine-Saint-Denis department, as well as the seat of the Arrondissement of Bobigny. It is the 11th most populous ''commune'' in Seine-Saint-Denis (2019). Inhabitants are called ''Balbyniens''. Bobigny is the seat of the Seine-Saint-Denis prefecture. The first IKEA store in France was located in this commune. Transport Bobigny is served by two stations on Paris Métro Line 5: Bobigny – Pantin – Raymond Queneau and Bobigny – Pablo Picasso. It can also be reached from the outer terminus of Paris Métro Line 7 at La Courneuve. Economy Valeo has management branches (Valeo Transmissions group and Valeo Friction Materials group) here. It was also the manufacturing base used by Meccano for French ''Dinky Toys'' from 1933 until 1970, when the factory was closed and later demolished. Produc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marseille
Marseille ( , , ; also spelled in English as Marseilles; oc, Marselha ) is the prefecture of the French department of Bouches-du-Rhône and capital of the Provence-Alpes-Côte d'Azur region. Situated in the camargue region of southern France, it is located on the coast of the Gulf of Lion, part of the Mediterranean Sea, near the mouth of the Rhône river. Its inhabitants are called ''Marseillais''. Marseille is the second most populous city in France, with 870,731 inhabitants in 2019 (Jan. census) over a municipal territory of . Together with its suburbs and exurbs, the Marseille metropolitan area, which extends over , had a population of 1,873,270 at the Jan. 2019 census, the third most populated in France after those of Paris and Lyon. The cities of Marseille, Aix-en-Provence, and 90 suburban municipalities have formed since 2016 the Aix-Marseille-Provence Metropolis, an indirectly elected metropolitan authority now in charge of wider metropolitan issues, with a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gestapo
The (), abbreviated Gestapo (; ), was the official secret police of Nazi Germany and in German-occupied Europe. The force was created by Hermann Göring in 1933 by combining the various political police agencies of Prussia into one organisation. On 20 April 1934, oversight of the Gestapo passed to the head of the '' Schutzstaffel'' (SS), Heinrich Himmler, who was also appointed Chief of German Police by Hitler in 1936. Instead of being exclusively a Prussian state agency, the Gestapo became a national one as a sub-office of the (SiPo; Security Police). From 27 September 1939, it was administered by the Reich Security Main Office (RSHA). It became known as (Dept) 4 of the RSHA and was considered a sister organisation to the (SD; Security Service). During World War II, the Gestapo played a key role in the Holocaust. After the war ended, the Gestapo was declared a criminal organisation by the International Military Tribunal (IMT) at the Nuremberg trials. History Af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
